utcksum.c File Reference

#include "acpi.h"
#include "accommon.h"
#include "acdisasm.h"
#include "acutils.h"

Include dependency graph for utcksum.c:

Go to the source code of this file.

Macros
#define	_COMPONENT   ACPI_CA_DISASSEMBLER

Functions
ACPI_STATUS	AcpiUtVerifyChecksum (ACPI_TABLE_HEADER *Table, UINT32 Length)
ACPI_STATUS	AcpiUtVerifyCdatChecksum (ACPI_TABLE_CDAT *CdatTable, UINT32 Length)
UINT8	AcpiUtGenerateChecksum (void *Table, UINT32 Length, UINT8 OriginalChecksum)
UINT8	AcpiUtChecksum (UINT8 *Buffer, UINT32 Length)

Macro Definition Documentation

_COMPONENT

#define _COMPONENT   ACPI_CA_DISASSEMBLER

Definition at line 52 of file utcksum.c.

Function Documentation

AcpiUtChecksum()

UINT8 AcpiUtChecksum	(	UINT8 *	Buffer,
		UINT32	Length
	)

Definition at line 213 of file utcksum.c.

{
    UINT8                   Sum = 0;
    UINT8                   *End = Buffer + Length;
 
 
    while (Buffer < End)
    {
        Sum = (UINT8) (Sum + *(Buffer++));
    }
 
    return (Sum);
}

Referenced by AcpiTbValidateRsdp(), and AcpiUtGenerateChecksum().

AcpiUtGenerateChecksum()

UINT8 AcpiUtGenerateChecksum	(	void *	Table,
		UINT32	Length,
		UINT8	OriginalChecksum
	)

Definition at line 176 of file utcksum.c.

{
    UINT8                   Checksum;
 
 
    /* Sum the entire table as-is */
 
    Checksum = AcpiUtChecksum ((UINT8 *) Table, Length);
 
    /* Subtract off the existing checksum value in the table */
 
    Checksum = (UINT8) (Checksum - OriginalChecksum);
 
    /* Compute and return the final checksum */
 
    Checksum = (UINT8) (0 - Checksum);
    return (Checksum);
}

Referenced by AcpiUtVerifyCdatChecksum(), and AcpiUtVerifyChecksum().

AcpiUtVerifyCdatChecksum()

ACPI_STATUS AcpiUtVerifyCdatChecksum	(	ACPI_TABLE_CDAT *	CdatTable,
		UINT32	Length
	)

Definition at line 130 of file utcksum.c.

{
    UINT8                   Checksum;
 
 
    /* Compute the checksum on the table */
 
    Checksum = AcpiUtGenerateChecksum (ACPI_CAST_PTR (UINT8, CdatTable),
                    CdatTable->Length, CdatTable->Checksum);
 
    /* Computed checksum matches table? */
 
    if (Checksum != CdatTable->Checksum)
    {
        ACPI_BIOS_WARNING ((AE_INFO,
            "Incorrect checksum in table [%4.4s] - 0x%2.2X, "
            "should be 0x%2.2X",
            AcpiGbl_CDAT, CdatTable->Checksum, Checksum));
 
#if (ACPI_CHECKSUM_ABORT)
        return (AE_BAD_CHECKSUM);
#endif
    }
 
    CdatTable->Checksum = Checksum;
    return (AE_OK);
}

AcpiUtVerifyChecksum()

ACPI_STATUS AcpiUtVerifyChecksum	(	ACPI_TABLE_HEADER *	Table,
		UINT32	Length
	)

Definition at line 74 of file utcksum.c.

{
    UINT8                   Checksum;
 
 
    /*
     * FACS/S3PT:
     * They are the odd tables, have no standard ACPI header and no checksum
     */
    if (ACPI_COMPARE_NAMESEG (Table->Signature, ACPI_SIG_S3PT) ||
        ACPI_COMPARE_NAMESEG (Table->Signature, ACPI_SIG_FACS))
    {
        return (AE_OK);
    }
 
    /* Compute the checksum on the table */
 
    Length = Table->Length;
    Checksum = AcpiUtGenerateChecksum (ACPI_CAST_PTR (UINT8, Table), Length, Table->Checksum);
 
    /* Computed checksum matches table? */
 
    if (Checksum != Table->Checksum)
    {
        ACPI_BIOS_WARNING ((AE_INFO,
            "Incorrect checksum in table [%4.4s] - 0x%2.2X, "
            "should be 0x%2.2X",
            Table->Signature, Table->Checksum,
            Table->Checksum - Checksum));
 
#if (ACPI_CHECKSUM_ABORT)
        return (AE_BAD_CHECKSUM);
#endif
    }
 
    return (AE_OK);
}

Referenced by AcpiTbParseFadt(), AcpiTbParseRootTable(), and AcpiTbVerifyTempTable().